Classification of Expansive Soils by Sediment Volume Method

A soil expansivity classification is proposed based on the sediment volume ratio defined as the ratio of the sediment volume in 0.025% sodium chloride solution to that in kerosene. The results of the proposed classification agree well with one based on the oedometer test results of compacted soil specimens.

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Site Overview
Former Agricultural Area in Southern California
Contamination
DDE, DDD, DDT, Toxaphene
History
Residual concentrations of chlorinated pesticides (DDE, DDD, DDT, and Toxaphene) were identified in soils around the former farm and dairy.
DDT and Toxaphene are chlorinated pesticides that were commonly used to control insects. DDE and DDD are common impurities and metabolites of DDT.
The size of the impacted area was approximately fifteen acres to a depth of two feet. The...

Municipalities everywhere are realizing that some of the environmental issues they are grappling with locally may be mitigated by healthier soils.
In the late 1990s, when Puget Sound Chinook salmon was listed as threatened, Washington State officials scrambled to find ways to improve water quality in the Puget Sound and protect spawning streams. They identified a number of methods to reduce environmental impacts and restore salmon habitat, including addressing a simple but growing problem: the loss of water...

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